I just got my new hybrid 3 days ago. Anyway, I rode my usual route to church early this morning from the beach to the mainland over the Hillsborough bridge. It was Sunday early and there was no traffic so I was flying down. No less than 4 minutes later when I came to a level stop at a light, the handlebar completely loosened from the stem. It didn't take more than a split second for me to realize how fortunate I am that it didn't happen just seconds earlier when I was coming down the bridge. What a wipeout that would have been. Not being a bike mechanic, I'm taking it back to the LBS where I purchased it tomorrow and tell the story and make them check and tighten every joint where safety is an issue. No big rides today and no bridges.